Display apparatus

Abstract

A display apparatus includes: a processing device receiving video signals of a video image by an image capturing device and processes an image of a frame in a viewable state based on the video signals to generate display signals; a display device receiving the display signals from the processing device and continuously displays, on a screen, images of a plurality of frames included in the display signals to display the video image; a setting device setting, for each frame, identification information to identify successive frames among the plurality of frames included in the display signals; and a detection device comparing the identification information of one frame of the image displayed on the display device with the identification information of a next one frame of the image displayed on the display device, and detecting that the screen of the display device freezes when both of the identification information are identical.

1 . A display apparatus comprising:
 a processing device that receives video signals of a video image captured by an image capturing device and processes an image of a frame in a viewable state based on the video signals to generate display signals;   a display device that receives the display signals from the processing device and continuously displays, on a screen, images of a plurality of frames included in the display signals to display the video image;   a setting device that sets, for each one frame of the plurality of frames, identification information to identify successive frames among the plurality of frames included in the display signals; and   a detection device that compares the identification information of one frame of the image displayed on the display device with the identification information of a next one frame, which is next to the one frame, of the image displayed on the display device, and detects that the screen of the display device freezes when both of the identification information of the one frame and the identification information of the next one frame are identical.   
     
     
         2 . The display apparatus according to  claim 1 , further comprising:
 a cancellation unit that cancels a state where images of identical frames are displayed on the display device when the detection device detects that the screen freezes.   
     
     
         3 . The display apparatus according to  claim 1 , wherein:
 the setting device is arranged in the processing device, and includes a code receiving unit that sets a code different in the successive frames among the plurality of frames included in the display signals as the identification information; and   the detection device is arranged in the display device, and includes a determination circuit unit that compares the code of the one frame of the image displayed on the display device with the code of the next one frame of the image displayed on the display device, to detect a freeze of the screen.   
     
     
         4 . The display apparatus according to  claim 3 ,
 wherein the code receiving unit sets the code at a position corresponding to a blanking period of the each one frame.   
     
     
         5 . The display apparatus according to  claim 3 , wherein:
 the display device includes a dot matrix-type display unit and a driving circuit unit applying a driving voltage to the display unit based on the display signals; and   the determination circuit unit is arranged in the driving circuit unit.   
     
     
         6 . The display apparatus according to  claim 3 , wherein:
 the display device includes a dot matrix-type display unit in which an effective display area is set as the screen, and a driving circuit unit applying a driving voltage to the display unit based on the display signals; and   the determination circuit unit is arranged around the effective display area of the display unit, and is electrically connected to the driving circuit unit.   
     
     
         7 . The display apparatus according to  claim 1 , wherein:
 the setting device is arranged in the display device, and acquires a sum of a plurality of image information items included in the each one frame as the identification information; and   the detection device is arranged in the display device, and includes a checksum circuit unit that compares the sum of the plurality of image information items of the one frame of the image displayed on the display device with the sum of the plurality of image information items of the next one frame of the image displayed on the display device, to detect whether the screen freezes.   
     
     
         8 . The display apparatus according to  claim 7 , wherein:
 the display device includes a dot matrix-type display unit and a driving circuit unit applying a driving voltage to the display unit based on the display signals; and   the checksum circuit unit is arranged in the driving circuit unit.   
     
     
         9 . The display apparatus according to  claim 7 , wherein:
 the display device includes a dot matrix-type display unit in which an effective display area is set as the screen, and a driving circuit unit applying a driving voltage to the display unit based on the display signals; and   the checksum circuit unit is arranged around the effective display area of the display unit, and is electrically connected to the driving circuit unit.   
     
     
         10 . The display apparatus according to  claim 1 , further comprising the image capturing device. 
     
     
         11 . The display apparatus according to  claim 1 , mounted at a vehicle.